Add attachments in off hire rebill section

In IMOS we would like to see the option to add attachments (like off hire statement, fuel calculation) in the off hire rebill screen. When added to the workflow the accounting department can process the invoices, add attachment and send out to the Technical Manager of the ship. Now a separate email with supporting documents is needed. To be noted that the option to add attachments is already available in all other invoice workflows (e.g. other rev/exp).